Contribution #96

Problem: ru/1.5.1

Added 1.1.2 1.1.3 1.1.5 1.1.6 1.2.1 1.2.4 1.2.5 1.3.3 1.4.1 1.4.3 1.5.1 1.5.2 2.5.3

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: October 11, 2023 at 09:40 AM

+251 -56 lines changed